Anyone running the same gear as this or real close to it? I would like to know the engine combo and rpm going through the traps. I have a set of 5.13's but don't know what rpm it will go through the 1/4. I really don't want to have a short living motor. Two years ago with these same 5.13 gears with alittle less power ran 7.50's but the tachometer quit working and the very first pass which was a 7.56 right before the tach quit working I remeber seeing like 7800 rpm. We didn't shift into high gear untill like 100 ft away from finish line. Tire size is 29.5x10.5 hoosier measures 30.6 tall and 11.1 wide with a roll out of 96". The converter is a TCI 4,000 stall 10" but is starting to losen up over time because it would only go to 3200-3500 at best now it goes 4000-4200. I think the tach was probaly pretty close to right because the motor sounded like it was turning some rpm. It was an old moroso mechanical tach.